Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

RN = V²/t.cp

RN = hl/k

RN = ρ V l /μ

RN = μ cp/k

RN = V²/t.cp

RN = hl/k

RN = ρ V l /μ

RN = μ cp/k

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Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/m²

kcal/hr °C

kcal/m² hr °C

kcal/m hr °C

kcal/m²

kcal/hr °C

kcal/m² hr °C

kcal/m hr °C

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Heat and Mass Transfer
When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

α = 1, ρ = 0 and τ = 0

α = 0, ρ = 0 and τ = 1

α = 0, ρ = 1 and τ = 0

α + ρ = 1 and τ = 0

α = 1, ρ = 0 and τ = 0

α = 0, ρ = 0 and τ = 1

α = 0, ρ = 1 and τ = 0

α + ρ = 1 and τ = 0

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Heat and Mass Transfer
In heat exchangers, degree of approach is defined as the difference between temperatures of

Hot medium inlet and outlet

Hot medium outlet and cold water inlet

Cold water inlet and outlet

Hot medium outlet and cold water outlet

Hot medium inlet and outlet

Hot medium outlet and cold water inlet

Cold water inlet and outlet

Hot medium outlet and cold water outlet

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Heat and Mass Transfer
Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)

k. (dT/dx)

k. A. (dx/dT)

k. (dx/dT)

k. A. (dT/dx)

k. (dT/dx)

k. A. (dx/dT)

k. (dx/dT)

k. A. (dT/dx)

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Heat and Mass Transfer
Fourier's law of heat conduction is valid for

One dimensional cases only

Regular surfaces having non-uniform temperature gradients

Three dimensional cases only

Two dimensional cases only

One dimensional cases only

Regular surfaces having non-uniform temperature gradients

Three dimensional cases only

Two dimensional cases only

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Heat and Mass Transfer

Heat and Mass Transfer Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer The unit of overall coefficient of heat transfer is

Heat and Mass Transfer When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

Heat and Mass Transfer In heat exchangers, degree of approach is defined as the difference between temperatures of

Heat and Mass Transfer Fourier's law of heat conduction is valid for

Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

Heat and Mass Transfer
When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

Heat and Mass Transfer
In heat exchangers, degree of approach is defined as the difference between temperatures of

Heat and Mass Transfer
Fourier's law of heat conduction is valid for